{
  "manageEntity": {
    "action": "Save",
    "entityId": "1438108360",
    "entityType": "Track",
    "nonce": "0xd4155db2f9486ada379a6c353c7e190455c12e6ed341bc6499f476cbb55b84dd",
    "signature": "0xd5745029aea77a1c1d3d2f20d6d902bc0d0f474a0fbd6cdf36a9eccfa87e96ec5cb21ac51964208c064256f48624f19f9d76368df603923423a20341de70de081c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}